Linker Histone H1 Modulates Nucleosome Remodeling by Human SWI/SNF
| Autor: | Peter S Cheslock, Aruna Ramachandran, Gavin R. Schnitzler, Mahera Omar |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Chromosomal Proteins
Non-Histone genetic processes macromolecular substances Biology Biochemistry Chromatin remodeling Histones Histone H1 Humans Nucleosome Histone code Histone octamer Chromatin structure remodeling (RSC) complex Molecular Biology fungi Templates Genetic Cell Biology Linker DNA Molecular biology SWI/SNF Nucleosomes Cell biology enzymes and coenzymes (carbohydrates) biology.protein biological phenomena cell phenomena and immunity HeLa Cells Transcription Factors |
| Zdroj: | Journal of Biological Chemistry. 278:48590-48601 |
| ISSN: | 0021-9258 |
| Popis: | Chromatin, a combination of nucleosomes and linker histones, inhibits transcription by blocking polymerase movement and access of factors to DNA. ATP-dependent remodeling complexes such as SWI/SNF and RSC alter chromatin structure to increase or decrease this repression. To further our understanding of how human SWI/SNF (hSWI/SNF) "remodels" chromatin we examined the octamer location, nature, and template specificity of hSWI/SNF-remodeled mononucleosomes when free or bound by linker histone H1. We find that, in the absence of H1, hSWI/SNF consistently moves nucleosomes to DNA ends, regardless of template sequence. On some sequences the repositioned histone octamer appears to be moved approximately 45 bp off the DNA edge, whereas on others it appears to be normal, suggesting that the nature of the remodeled nucleosome can be influenced by DNA sequence. By contrast, in the presence of histone H1, hSWI/SNF slides octamers to more central positions and does not promote nucleosome movement off the ends of the DNA. Our results indicate that the nature and position of hSWI/SNF products may be influenced both by DNA sequence and linker histone, and shed light on the roles of H1 and hSWI/SNF in modulating chromatin structure. |
| Databáze: | OpenAIRE |
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